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Equity Incentive Plan - Restricted Share Awards Granted and Vested (Details) - shares |  |  |  |  | 12 Months Ended | 31 Months Ended | 35 Months Ended | 47 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 11, 2017 | Jun. 01, 2015 | Jan. 30, 2015 | Jan. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017
Time-based Restricted Stock Awards | Awarded January 31, 2014 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total Shares Granted |  |  |  | 48,213 |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  | 48,213
Time-based Restricted Stock Awards | Awarded January 30, 2015 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total Shares Granted |  |  | 40,161 |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  | 26,774 |
Time-based Restricted Stock Awards | Awarded June 1, 2015 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total Shares Granted |  | 8,949 |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  | 5,966 |  |
Performance-based Restricted Stock Awards | Awarded January 31, 2014 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total Shares Granted |  |  |  | 38,805 |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  | 12,935
Performance-based Restricted Stock Awards | Awarded January 30, 2015 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total Shares Granted |  |  | 36,144 |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  | 0 |
Restricted Board Awards | Awarded November 11, 2017 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total Shares Granted | 5,000 |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  | 0 |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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